*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    color: #1a1a1a;
    line-height: 1.65;
    background: #fff;
}

/* ── Nav ─────────────────────────────── */
header {
    background: #0f172a;
    padding: 1rem 1.5rem;
}

header nav {
    max-width: 860px;
    margin: 0 auto;
}

.logo {
    color: #fff;
    font-weight: 800;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
    text-decoration: none;
}

.logo span {
    color: #818cf8;
}

/* ── Hero ────────────────────────────── */
.hero {
    background: #0f172a;
    color: #fff;
    padding: 5rem 1.5rem 4.5rem;
    text-align: center;
    border-bottom: 1px solid #1e293b;
}

.hero h1 {
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 0.6rem;
    line-height: 1.1;
}

.hero .tagline {
    font-size: clamp(1rem, 2.5vw, 1.3rem);
    color: #94a3b8;
    margin-bottom: 2rem;
    font-style: italic;
}

.hero .intro {
    max-width: 580px;
    margin: 0 auto;
    font-size: 1.05rem;
    color: #cbd5e1;
    line-height: 1.75;
}

/* ── Sections ────────────────────────── */
.section {
    padding: 3.5rem 1.5rem;
}

.section-inner {
    max-width: 760px;
    margin: 0 auto;
}

.section:nth-child(odd) {
    background: #f8fafc;
}

.section:nth-child(even) {
    background: #fff;
}

.section h2 {
    font-size: 1.55rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

.section p {
    margin-bottom: 1rem;
    font-size: 0.975rem;
    color: #374151;
}

/* ── Problem list ────────────────────── */
.problem-list {
    list-style: none;
    margin: 1.25rem 0 0;
}

.problem-list li {
    padding: 0.7rem 0 0.7rem 1.6rem;
    position: relative;
    border-bottom: 1px solid #e5e7eb;
    font-size: 0.95rem;
    color: #374151;
}

.problem-list li:last-child {
    border-bottom: none;
}

.problem-list li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: #dc2626;
    font-weight: 700;
}

.problem-list li strong {
    color: #111827;
}

/* ── Target grid ─────────────────────── */
.target-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
    margin-top: 1.25rem;
}

@media (max-width: 580px) {
    .target-grid {
        grid-template-columns: 1fr;
    }
}

.target-box {
    padding: 1.25rem 1.25rem 1rem;
    border-radius: 7px;
    border: 1px solid #e5e7eb;
}

.target-box.not-for {
    background: #fff5f5;
    border-color: #fecaca;
}

.target-box.is-for {
    background: #f0fdf4;
    border-color: #bbf7d0;
}

.target-box h3 {
    font-size: 0.78rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 0.85rem;
}

.target-box.not-for h3 {
    color: #dc2626;
}

.target-box.is-for h3 {
    color: #16a34a;
}

.target-box ul {
    list-style: none;
}

.target-box ul li {
    padding: 0.3rem 0 0.3rem 1.3rem;
    font-size: 0.875rem;
    color: #374151;
    position: relative;
}

.target-box.not-for ul li::before {
    content: "✕";
    position: absolute;
    left: 0;
    color: #dc2626;
    font-size: 0.8rem;
    top: 0.35rem;
}

.target-box.is-for ul li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #16a34a;
    font-size: 0.85rem;
    top: 0.3rem;
}

/* ── Idea list ───────────────────────── */
.idea-items {
    list-style: none;
    margin-top: 1.25rem;
}

.idea-items li {
    padding: 0.75rem 0 0.75rem 1.6rem;
    position: relative;
    border-bottom: 1px solid #e5e7eb;
    font-size: 0.95rem;
    color: #374151;
}

.idea-items li:last-child {
    border-bottom: none;
}

.idea-items li::before {
    content: "·";
    position: absolute;
    left: 0.45rem;
    top: 0.45rem;
    color: #6366f1;
    font-size: 1.6rem;
    line-height: 1;
}

.status-badge {
    display: inline-block;
    background: #fef3c7;
    color: #92400e;
    border: 1px solid #fcd34d;
    border-radius: 4px;
    padding: 0.1rem 0.5rem;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-left: 0.4rem;
    vertical-align: middle;
    position: relative;
    top: -1px;
}

/* ── Not-list ────────────────────────── */
.not-list {
    list-style: none;
    margin-top: 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

@media (max-width: 480px) {
    .not-list {
        grid-template-columns: 1fr;
    }
}

.not-list li {
    background: #f1f5f9;
    border: 1px solid #e2e8f0;
    border-radius: 6px;
    padding: 0.7rem 1rem;
    font-size: 0.875rem;
    color: #475569;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.not-list li::before {
    content: "✕";
    color: #94a3b8;
    font-size: 0.75rem;
    flex-shrink: 0;
}

/* ── Signup form ─────────────────────── */
.form-section {
    background: #0f172a !important;
    color: #fff;
}

.form-section h2 {
    color: #fff;
}

.form-section .lead {
    color: #94a3b8 !important;
    margin-bottom: 0.5rem;
}

.form-section .disclaimer {
    color: #64748b !important;
    font-size: 0.85rem !important;
    margin-bottom: 1.5rem;
}

.signup-form {
    margin-top: 1.5rem;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
    color: #e2e8f0;
}

.form-group .hint {
    display: block;
    font-size: 0.78rem;
    color: #64748b;
    font-weight: 400;
    margin-top: 0.2rem;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="number"],
.form-group textarea {
    width: 100%;
    padding: 0.65rem 0.875rem;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 5px;
    color: #f1f5f9;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.15s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #6366f1;
    background: #1e293b;
}

.form-group textarea {
    min-height: 90px;
    resize: vertical;
}

.radio-group {
    display: flex;
    gap: 1.5rem;
    margin-top: 0.3rem;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 400;
    cursor: pointer;
    color: #e2e8f0;
    font-size: 1rem;
}

.radio-group input[type="radio"] {
    width: 1rem;
    height: 1rem;
    accent-color: #6366f1;
    flex-shrink: 0;
}

.error-msg {
    background: #7f1d1d;
    border: 1px solid #ef4444;
    color: #fecaca;
    padding: 0.75rem 1rem;
    border-radius: 5px;
    margin-bottom: 1.25rem;
    font-size: 0.9rem;
}

.submit-btn {
    background: #6366f1;
    color: #fff;
    border: none;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 5px;
    cursor: pointer;
    width: 100%;
    transition: background 0.15s;
    font-family: inherit;
}

.submit-btn:hover {
    background: #4f46e5;
}

/* ── Footer ──────────────────────────── */
footer {
    background: #f1f5f9;
    border-top: 1px solid #e2e8f0;
    padding: 2rem 1.5rem;
}

.footer-inner {
    max-width: 760px;
    margin: 0 auto;
    text-align: center;
}

.footer-inner p {
    font-size: 0.85rem;
    color: #64748b;
    margin-bottom: 0.5rem;
}

.footer-inner a {
    color: #6366f1;
    text-decoration: none;
}

.footer-inner a:hover {
    text-decoration: underline;
}

.footer-small {
    font-size: 0.75rem !important;
    color: #94a3b8 !important;
    margin-top: 0.25rem;
}

/* ── Tak page ────────────────────────── */
.tak-section {
    min-height: 65vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 1.5rem;
    background: #f8fafc;
}

.tak-card {
    max-width: 520px;
    text-align: center;
    background: #fff;
    border: 1px solid #e5e7eb;
    border-radius: 10px;
    padding: 2.5rem 2rem;
}

.tak-icon {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

.tak-card h1 {
    font-size: 1.9rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.tak-card p {
    color: #6b7280;
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
}

.back-link {
    display: inline-block;
    margin-top: 1.25rem;
    color: #6366f1;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
}

.back-link:hover {
    text-decoration: underline;
}

/* ── Admin ───────────────────────────── */
.admin-section {
    padding: 2rem 1.5rem;
    max-width: 1100px;
    margin: 0 auto;
}

.admin-section h1 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.4rem;
}

.admin-meta {
    color: #6b7280;
    font-size: 0.875rem;
    margin-bottom: 1.5rem;
}

.table-wrapper {
    overflow-x: auto;
}

.signups-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}

.signups-table th {
    background: #f1f5f9;
    padding: 0.6rem 0.75rem;
    text-align: left;
    font-weight: 600;
    border-bottom: 2px solid #e2e8f0;
    white-space: nowrap;
    color: #374151;
}

.signups-table td {
    padding: 0.6rem 0.75rem;
    border-bottom: 1px solid #e5e7eb;
    vertical-align: top;
}

.signups-table tr:hover td {
    background: #f8fafc;
}

.badge-ja {
    background: #dcfce7;
    color: #166534;
    padding: 0.1rem 0.45rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-nej {
    background: #fee2e2;
    color: #991b1b;
    padding: 0.1rem 0.45rem;
    border-radius: 3px;
    font-size: 0.75rem;
    font-weight: 700;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: #9ca3af;
}